Crystallization thermometers for zircon and rutile

E. B. Watson, D. A. Wark, Jay Thomas

Research output: Contribution to journalArticle

948 Citations (Scopus)

Abstract

Zircon and rutile are common accessory minerals whose essential structural constituents, Zr, Ti, and Si can replace one another to a limited extent. Here we present the combined results of high pressure-temperature experiments and analyses of natural zircons and rutile crystals that reveal systematic changes with temperature in the uptake of Ti in zircon and Zr in rutile. Detailed calibrations of the temperature dependencies are presented as two geothermometers - Ti content of zircon and Zr content of rutile-that may find wide application in crustal petrology. Synthetic zircons were crystallized in the presence of rutile at 1-2 GPa and 1,025-1,450 °C from both silicate melts and hydrothermal solutions, and the resulting crystals were analyzed for Ti by electron microprobe (EMP). To augment and extend the experimental results, zircons hosted by five natural rocks of well-constrained but diverse origin (0.7-3 GPa; 580-1,070 °C) were analyzed for Ti, in most cases by ion microprobe (IMP). The combined experimental and natural results define a log-linear dependence of equilibrium Ti content (expressed in ppm by weight) upon reciprocal temperature: log(Tizircon) = (6.01±0.03) - 5080 ± 30/T (K). In a strategy similar to that used for zircon, rutile crystals were grown in the presence of zircon and quartz (or hydrous silicic melt) at 1-1.4 GPa and 675-1,450 °C and analyzed for Zr by EMP. The experimental results were complemented by EMP analyses of rutile grains from six natural rocks of diverse origin spanning 0.35-3 GPa and 470-1,070 °C. The concentration of Zr (ppm by weight) in the synthetic and natural rutiles also varies in log-linear fashion with T-1: log (Zrrutile) = (7.36±0.10) - 4470 ± 120/T(K). The zircon and rutile calibrations are consistent with one another across both the synthetic and natural samples, and are relatively insensitive to changes in pressure, particularly in the case of Ti in zircon. Applied to natural zircons and rutiles of unknown provenance and/or growth conditions, the thermometers have the potential to return temperatures with an estimated uncertainty of ±10 ° or better in the case of zircon and or better in the case of rutile over most of the temperature range of interest (∼400-1,000 °C). Estimates of relative temperature or changes in temperature (e.g., from zoning profiles in a single mineral grain) made with these thermometers are subject to analytical uncertainty only, which can be better than ±5° depending on Ti or Zr concentration (i.e., temperature), and also upon the analytical instrument (e.g., IMP or EMP) and operating conditions.

Original languageEnglish (US)
Pages (from-to)413-433
Number of pages21
JournalContributions to Mineralogy and Petrology
Volume151
Issue number4
DOIs
StatePublished - Apr 2006
Externally publishedYes

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Thermometers
thermometers
rutile
Crystallization
zircon
crystallization
electron probe analysis
temperature
Temperature
Electrons
ion microprobe
crystal
Crystals
Minerals
titanium dioxide
electrons
minerals
rocks
Rocks
crystals

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Crystallization thermometers for zircon and rutile. / Watson, E. B.; Wark, D. A.; Thomas, Jay.

In: Contributions to Mineralogy and Petrology, Vol. 151, No. 4, 04.2006, p. 413-433.

Research output: Contribution to journalArticle

Watson, E. B. ; Wark, D. A. ; Thomas, Jay. / Crystallization thermometers for zircon and rutile. In: Contributions to Mineralogy and Petrology. 2006 ; Vol. 151, No. 4. pp. 413-433.
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